sloane



Feb. 14, 1956 w. w. SLOANE 2,734,688

PAIRED ROLL CRUSHER AND GRIZZLY FEED DEVICE THEREFOR 3 Sheets-5heet 1 Filed Nov. 4, 1952 INVENTOR.

jTTOiEA/[ Feb. 14, 1956 w. w. SLOANE 2,734,688

PAIRED ROLL CRUSHER AND GRIZZLY FEED DEVICE THEREFOR 5 Sheets-Sheet 2 Filed NOV. 4, 1952 f P I OINlf/ENTOR. 6 4/1/1410 41 ,5 Wan/M W 4. 21 m 7 Aria/elm United States Patent PAIRED ROLL CRUSHER AND GRIZZLY FEED DEVICE THEREFOR William W. Sloane, Chicago, 111., assignor to Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Application November 4, 1952, Serial No. 313,543

3 Claims. (Cl. 241-222) This invention relates generally to ore and rock crushing machinery, and more particularly to improvements in devices for improving the feed of material to a roll type crusher.

There has been a problem of obtaining uniform sizes of crushed material which has not been solved prior to the present invention. This problem is most pronounced with corrugated roll crushers and arises in the following manner:

Feed material caught between mating corrugations is referred to in the art as nipped. The bigger the corrugations, bigger the raw material sizes that will be nipped. Lumps are nipped, of course, as they approach the line of closest convergence of the rolls. That is, in the usual case lumps are nipped above the roll centers and progressively crushed as they are carried down to the center. There is a limit, heretofore poorly appreciated, to which the nipped material can be crushed and still maintain control over particle sizes. This limit is reached when crushing fills the voids initially between the fed lumps; after that, the rock acts as an incompressible solid. Hence, if the material reaches this incompressible state before it reaches the point of closest tangency between the rolls, the latter will be forced open against their overload springs to let unwanted oversize product through.

To solve this problem, applicant feeds material initially in a stream which is not greater than the cross-sectional area between rolls along their line of closest convergence. This is done by feeding the rock into the crusher in a series of ribbons whose total. cross-sectional area is equal to or less than the area of the space between the rolls as measured on a plane connecting the centerlines of the rolls.

Width of the feed streams is controlled and limited by a grizzly which closely follows the contour of the rolls.

The present invention is also characterized by a grizzly which feeds the material along the rolls in ribbons or streams which alternate with zones free of such material, so that as the rolls turn and the material is carried by the intermeshing roller faces, the material caught between the faces and partially crushed thereby is enabled to move into the zones free of such material, and in such a fashion that as the rollers approach their line of conjugacy the partially crushed material lies in wider ribbons along the length of the rolls separated by more narrow zones to be crushed to the final desired sizes as the rolls approach their line of conjugacy.

With the foregoing considerations in mind it is a principal object of the invention to provide a new and improved roll crusher characterized by improved feeding of material thereto, to the end that the crushing of such material occurs in a uniform fashion along the entire length of the crusher rolls.

Another important object of the invention is to afford a new and improved grizzly for a roll type crusher, which grizzly is characterized by feeding of material transversely of the crusher rollers and in ribbons or streams alternating with zones free of such material, all of such alternate 2,734,688 Patented Feb. 14, 1956 ribbons and zones extending for the length of the rolls, to the end that as the material is initially and partially crushed by engagement of the rolls, space will be afforded by the zones free of such material, and so that as the material enters the final crushing at the line of conjugacy of the rolls, such zones will afford space for the material as it is crushed to its finest sizes.

Other objects and important features of the invention will be apparent from a study of. the following specification taken with the drawingsv which together show a preferred embodiment of the invention, and what is now considered to be the best mode of practicing the principles thereof. Other embodiments of the invention may be suggested to those having the benefit of the teachings herein, and it is therefore intended that the scope of the invention not be limited by the precise embodiment herein shown, the scope thereof being intended to be defined only by the claims subjoined.

In the drawings:

Fig. 1 is a plan view of a form of roll type crusher to which the present invention is particularly adaptable;

Fig. 2 is a longitudinal section taken along the line 2-2 of Fig. 1 looking in the direction of the arrows;

Fig. 3 is a more or less schematic view of the crusher shown in Figs. 1 and 2, showing in longitudinal section a grizzly adapted for use therewith and having embodied therein the improvements according to the present invention;

Fig. 4 is a transverse sectional view taken along the line 4-4 of Fig. 3 looking in the direction of the arrows;

Fig. 5 is a top plan view of the grizzly shown in Fig. 3;

Fig. 6 is an enlarged fragmentary elevational view taken along the line 6-6 of Fig. 2 looking in the direction of the arrows, showing the fragmentation of the material as it is gripped by the iuterme'shing rolls;

Fig. 7 is an enlarged fragmentary plan view of the crushing rolls, particularly at their line of conjugacy, looking in the direction of the arrows 7-7 of Fig. 6-; and

Fig. 8 is an enlarged vertical sectional view taken along the line S8 of Fig. 6 looking in the direction of the arrows. l

Referring now to the drawings, the reference numeral 10 refers to a roll type crusher embodying the improvements according to the present invention. Such a roll type crusher has an improved grizzly denoted generally by the reference numeral 15, and shown in Figs. 3 to 5 inelusive.

The roll type crusher 10 includes a rectilinear frame 11 having spaced parallel side rails 12 and 13. These side rails afford support for aligned pairs of shaft bearings 14, 16 and 17, 18, and a lengthwise adjustable pair of shaft bearings 19, 21. The latter pair of shaft bearings 19 and 21 are shiftably mounted in slideways 22 and 23, so as to be adjusted under tension by means of adjustment screws 24 and 26 and tensioning springs 27 and 28.

A main drive shaft 29 is supported in the bearings 14 and 16 and is provided at one end with a pulley 31 driven by a belt 32 connected to any convenient source of power, not shown. A driving sprocket 33 is made fast to the shaft 29 and is mounted thereon between the bearing 16 and the pulley 31. A driving chain 34 is trained around the sprocket 33 and a sprocket 36 having a hub 37 which is made fast to a shaft 38' supported in the bearings 19 and 21. H

The opposite end of the drive shaft 29 is provided with a pinion 39, made fast thereto and meshing with a driving gear 41 fast to a roll shaft 42 supported in the spaced bearings 17 and 18. The roll shaft 42 supports a crusher roll 43 having fast thereon a concave roller shell 44. The roller shaft 38 has mounted thereon a roll 46 supporting a shell 47 fast thereon and of convex 3 configuration, so as to be conjugate with the concave shell 44. As seen in Figs. 1 and 2, the shells 44 and 47 have conjugate corrugations 48 which are spaced a slight distance 49 apart along their line of closest tangency, that is in a plane connecting the centerline of the two rolls.

The ratios between the driving pinion 39 and the gear 41, and the driving sprocket 33 and the driven sprocket 36 are such that the rolls 43 and 46 are driven in opposite directions at the same speed, roll 43 being driven in a clockwise direction and the roll 46 being driven in a counterclockwise direction as seen in Fig. 2.

The roll crusher thus far described is fed by the grizzly, as seen in Figs. 3 to 5, which has been referred to generally by the reference numeral 15. The grizzly 15 has substantially vertical side walls 51 and essentially vertical end walls 52. The side walls i and the end walls 52 define with bottom elements 53, a hopper for receiving material to be fragmented by the crusher rolls 43 and 46.

The elements 53 consist of angle members, as seen in Fig. 4, and have curved portions of a radius which is larger than the maximum radius of convex shell 47 and concave shell 44. The curved elements are thereby spaced a desired distance from the shells 44 and 47 for a purpose as will appear. Each of the curved elements 53 thus is joined with a complementary curved element 53 along a line of apices 54 as seen more clearly in Figs. 3 and 5. The angle elements 53 are spaced equal distances apart as seen in Figs. 4 and 5 to provide longitudinal openings 56 extending between each element 53 and for a length corresponding to the length of such elements 53.

Means are provided for supporting the grizzly 15 in proper position above the crushing rolls 43 and 46 by means of spaced rails 57 and 58 disposed near the top edges of the side Walls 51. The spaced rails 57 and 58 embrace a rail 59 extending inwardly from side frame members 61 forming a part of the structure of the roll crusher 10.

Means are provided for imparting reciprocatory movement to the grizzly 15, and as seen in Fig. 1 the hub 37 is formed integrally with a sprocket 62 having a chain 63 trained therearound, which chain in turn is trained around a sprocket 64 made fast to a shaft 66. The shaft 66 has an eccentric 67 thereon which cooperates with an eccentric connecting rod 68 having a hinge connection as at 69 to an abutment 71 extending from one of the end walls 52 of the grizzly 15.

When the grizzly 15 is reciprocated by the eccentric 67 and the connecting rod 68, the material held therein will drop through the openings 56 onto the shells 44 and 47. The space between the curved elements 53 of the grizzly 15 and the shells 44 and 47 effectively limits the amount of material able to pass through the openings 56, at the same time causing the material to be distributed evenly in ribbons or streams throughout the length of the shells 44 and 47 separated by zones free of such material.

The openings 56 and the elements 53 likewise evenly space the material to be crushed throughout the length of the crushing roller shells 44 and 47. As seen in Figs. 6 to 8 inclusive, material M passes through the openings on to the faces of the roller shells 44 and 47 to be moved on such rolls as ribbons or streams which alternate with zones Z free of such material.

As the roller shells grip the material M, it is partially fragmented to sizes indicated by the reference characters M2. As the material is fragmented to the size denoted by M2 the particles are enabled to move into the zone Z. As the rolls turn further to crush the material, it is reduced in size to particles indicated by the reference character Ma. In so doing the particles may further be spread evenly into the zones indicated by the reference character Z. 4

As the roller shells approach their line of conjugacy, as seen more clearly in Figs. 7 and 8, the particles are crushed and distributed in wider ribbons over the roller shells 44 and 47 separated by more narrow zones until the material is fragmented to sizes as indicated by the reference character M4.

it will thus be seen that the material M is effectively distributed in ribbons separated by narrow zones along the entire length of the crushing rolls at its final crushing stage when the crushing rollers are conjugate. By so doing, all of the material is crushed to the desired sizes.

Moreover, by distributing the material in the fashion described, the occurrence of long splinter-like fragments is largely eliminated, and the particles in their, final size will have substantially a cube like configuration.

Also, the limited amplitude of movement of the grizzly causes the spacing between the curved elements 53 and the shells 44 and 47 to vary but slightly, thus effectively maintaining metering by the openings 56 and the spacing to be kept reasonably constant, and thereby permitting of a supply of material to the conjugate faces of the shells 44 and 47 at a corresponding constant rate.

With the supply of material thus effectively metered and distributed by the grizzly 15 there will thus be even distribution over the length of the shells, and as a result the wear thereon will be substantially uniform throughout the length of such shells.

While the invention has been shown and described in connection witha roll type crusher of the kind having concave-convex crushing rolls, it is equally effective with roll crushers of the kind employing cylindrical rolls, either plain or corrugated. It is thereforeintended that the scope of the invention not be limited because of the type of crusher herein shown, and that the invention be limited only by the scope of the claims here appended.

I claim:

1. In a roll crusher of the type having a pair of cooperating crushing rolls arranged to nip material and crush same to a desired size at the line of conjugacy of said rolls, the improvement in such a crusher comprising a grizzly mounted above the rolls thereof including means for providing shaking motion thereto, a discharge bottom for said grizzly, said discharge bottom having substantially uniformly spaced discharge openings therein and having curved portions extending toward the line of conjugacy of said rolls, said curved portions meeting along a line spaced a distance from the line of conjugacy of said rolls, said curved portions having radii in planes normal to the axes of said rolls which are greater than the maximum radius of their proximate roll at such corresponding plane, so as to provide a metering space for material passing said discharge openings.

2. Improvement in grizzlies for a roll crusher of the type having a pair of cooperating crushing rolls, said grizzly comprising a reciprocating hopper having a discharge bottom provided With substantially uniformly spaced openings therein, said discharge bottom being arranged with a portion which is curved along a radius which is greater than the maximum radius of the proximate roll as measured along a plane normal to the axis of said roll, the spacing of the curved portion of the discharge bottom from the rolls thereby providing a metering passageway for material passing said discharge openings.

3. In a roll type crusher, a grizzly mounted above the rolls of said crusher for limited amplitude of movement, a discharge bottom for said grizzly, said discharge bottom comprising a grating having longitudinal openings therein, said grating being constructed and arranged with a portion curved along a radius which is greater than the maximum radius of a proximate roll as measured along a plane normal to the axis of said roll, said 10ngitudinal openings in said grating and the spacing of said curved portion from said rolls providing metering of ribbons of material along the faces of the rolls of said crusher which alternate with zones on the faces of said rolls free from such material, whereby as the rolls approach their line of conjugacy the material fragmented thereby will move into such Zones.

References Cited in the file of this patent UNITED STATES PATENTS 6 Sable July 4, 1905 Gibson June 8, 1909 Johnston May 2, 1911 Frazee Ian. 9, 1912 Gillespie Apr. 3, 1923 Earle Dec. 11, 1923 Lowenthal May 11, 1926 Udden Feb. 25, 1947 MacDonald Sept. 11, 1951 FOREIGN PATENTS Denmark Dec. 8, 1919 Switzerland Jan. 8, 1906 France May 21, 1910 

